Geoeges henri huaed



(No Model.)

` G. H. HUARD.-

APPARATUS F03 TRANSPOSITION 0F MUSIC. No. (363!392. Patented May24,1887.

@ @kw N' .space between the white spaces.

UNITED STATES PATENT OFFICE.

GEORGES HENRI HUARD, 4OF PARIS, FRANCE.

APPARATUS FOR TRANSPOSITION OF.MUSIC.

SPECIFICATION forming part of Letters Patent No, 363,392, dated May 24,1887. Application filed January :22, 1887. Serial No. 225,152. (Nomodel.) Patented in France October 27, 1SB6,-NI0. 179,286.

To @ZZ whom it may concern.- Y

Be it known that I, GEoReEs HENRI HUAED, clock-maker, a citizen ofFrance, residing at Paris, in the French Republic, have invented a newand useful Improvement in Apparatus for the Transposition of Music, (forwhich I have obtained a patent in France, dated October 27, '1886, andnumbered 179, 286,) of which the following is a specification.

The apparatus is intended for methodically and mechanically transposingmusic at rst sight. Itis or may be iliade of wood or anysuitable-substance; and it consists, essentially, of a frame and twoparallel rulers with openings or windows placed directly one above theother and sliding longitudinally in grooves of the frame, so as to maskby closed parts and unmask by open parts colored divisions on the framefor transposing the notes of a gamut fromsharps to flats, and viceversa.

Figure l of the accompanying drawings represents an apparatus of thedescription embodying my invention, seen in front view and closed. Fig.2 is a longitudinal section made at the line l 2 of Fig. 1. Fig. 3 is atransverse section at the line 3 4 of Fig. 1. Fig. 4 represents theapparatus minus its two movable ruliri, one ot' which is shown in Fig.5.

The apparatus consists of a frame, a, and two rulers, b b', slidingbetween the grooves d clff. These rulers have thirteen openings orwindows, 7c k, separa-ted by spaces of equal dimensions, on which thenotes of two consecutive gamuts are marked do, r, mi, fa, sol,

la, si-dohr, ini, ia, sol, la, si.

Vertical strokes y, marked below the notes for the upper ruler, b, andabove for those below, b', serve to mark the transposition.

The frame a, divided into two equal parts by the longitudinalprojections ff, is made with ,vertical colored or distinctive spaces.The upper ones exactly correspond with those below.v rlhe spaces x arewhite, of the same width as those of the openings or windows oftherulers. They are contiguous on the right to a space, y, colored in red,and on the left to a black space, e, cach color occupying half the Bythis characteristic arrangement the two gamuts in do major, placed oneabove the other, Fig. l, have their notes separated by spaces showingthe importance ofthe tones, either a semi-tone of mi to fa and si t0 do,and a tone for all the Other notes.

In sliding the rulers b b in one or other direction either red or blackspaces appear. The reds indicate ilats and the blacks the sharps.Consequently, when the red spaces appear the tone is lowered ahalf-tonc-that is to say, flat; and they are raised a half-tone or intosharps when the black spaces are visible.

Trans Josi'ion.-Starting from la, if the lower ruler, b, indicates thekey of the piece to be transposed, and the upper one, b, the key intowhich it is to be transposed, the instrument is used as follows: Totranspose it to a major key it suffices to put the first note of each ofthe gamuts in front of the guide-mark o, Fig. l, marked at the left-handend of the separating-projection ff. For instance, to transfer a gamutin r major to mi flat major, place the re of the lower ruler in frontofthe guide-mark o, and then place the flat mi of the upper rulerin Yfront of the same mark o. It will at once be seen that the r becomes miiiat, that the mi becomes fa, that the fa sharp corresponds with sol,that sol becomes do, and do becomes r.

For minor gamuts the relation is indicated by a mark, v7L, on theseparation ff corresponding with the note la. When the note is anaccidental sharp or dat, it is lowered or raised a half-tone, accordingas it is sharp or tlat.

No mistakes can occur, pupils being compelled to transpose correctly.For instance, when a person wishes to raise a piece in r half a tone, heplaces the upper ruler to r sharp, when the gamut cannot be executed.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is

The apparatus herein described for the transposition of music,consisting of a frame having colored divisions and two parallel rulershaving openings and spaces on which are the notes of tliegamut, placeddirectly the one above the other and sliding longitudinally in groovesof the frame, thereby masking by closed divisions and nnmasking by opendivisions the colored spaces on the frame in transposing the notes ofthe gamut from sharps to Hats, and vice versa, substantially asdescribed.

IOO

cEoEGEs HENRI HUAED.

Witnesses:

Roer. M. HoorEE, V.ALiu-IonsE BLTRY.

